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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
mfd: smsc: Add support for smsc gpio io/keypad driver
smsc ece1099 is a keyboard scan or gpio expansion device.
The patch create keypad and gpio expander child for this
multi function smsc driver.
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
authored by
Sourav Poddar
and committed by
Samuel Ortiz
8284328c
c6bed9de
+291
+56
Documentation/smsc_ece1099.txt
+56
Documentation/smsc_ece1099.txt
···
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What is smsc-ece1099?
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----------------------
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The ECE1099 is a 40-Pin 3.3V Keyboard Scan Expansion
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or GPIO Expansion device. The device supports a keyboard
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scan matrix of 23x8. The device is connected to a Master
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via the SMSC BC-Link interface or via the SMBus.
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Keypad scan Input(KSI) and Keypad Scan Output(KSO) signals
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are multiplexed with GPIOs.
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Interrupt generation
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--------------------
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Interrupts can be generated by an edge detection on a GPIO
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pin or an edge detection on one of the bus interface pins.
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Interrupts can also be detected on the keyboard scan interface.
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The bus interrupt pin (BC_INT# or SMBUS_INT#) is asserted if
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any bit in one of the Interrupt Status registers is 1 and
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the corresponding Interrupt Mask bit is also 1.
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In order for software to determine which device is the source
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of an interrupt, it should first read the Group Interrupt Status Register
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to determine which Status register group is a source for the interrupt.
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Software should read both the Status register and the associated Mask register,
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then AND the two values together. Bits that are 1 in the result of the AND
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are active interrupts. Software clears an interrupt by writing a 1 to the
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corresponding bit in the Status register.
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Communication Protocol
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----------------------
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- SMbus slave Interface
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The host processor communicates with the ECE1099 device
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through a series of read/write registers via the SMBus
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interface. SMBus is a serial communication protocol between
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a computer host and its peripheral devices. The SMBus data
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rate is 10KHz minimum to 400 KHz maximum
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- Slave Bus Interface
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The ECE1099 device SMBus implementation is a subset of the
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SMBus interface to the host. The device is a slave-only SMBus device.
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The implementation in the device is a subset of SMBus since it
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only supports four protocols.
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The Write Byte, Read Byte, Send Byte, and Receive Byte protocols are the
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only valid SMBus protocols for the device.
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- BC-LinkTM Interface
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The BC-Link is a proprietary bus that allows communication
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between a Master device and a Companion device. The Master
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device uses this serial bus to read and write registers
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located on the Companion device. The bus comprises three signals,
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BC_CLK, BC_DAT and BC_INT#. The Master device always provides the
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clock, BC_CLK, and the Companion device is the source for an
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independent asynchronous interrupt signal, BC_INT#. The ECE1099
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supports BC-Link speeds up to 24MHz.
+12
drivers/mfd/Kconfig
+12
drivers/mfd/Kconfig
···
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help
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Support for Toshiba Mobile IO Controller T7L66XB
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config MFD_SMSC
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bool "Support for the SMSC ECE1099 series chips"
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depends on I2C=y
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select MFD_CORE
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select REGMAP_I2C
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help
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If you say yes here you get support for the
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ece1099 chips from SMSC.
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To compile this driver as a module, choose M here: the
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module will be called smsc.
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config MFD_TC6387XB
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bool "Support Toshiba TC6387XB"
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depends on ARM && HAVE_CLK
+1
drivers/mfd/Makefile
+1
drivers/mfd/Makefile
+113
drivers/mfd/smsc-ece1099.c
+113
drivers/mfd/smsc-ece1099.c
···
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/*
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* TI SMSC MFD Driver
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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*
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* Author: Sourav Poddar <sourav.poddar@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; GPL v2.
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/irq.h>
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#include <linux/regmap.h>
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#include <linux/err.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/smsc.h>
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#include <linux/of_platform.h>
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static struct regmap_config smsc_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = SMSC_VEN_ID_H,
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.cache_type = REGCACHE_RBTREE,
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};
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static int smsc_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct smsc *smsc;
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int devid, rev, venid_l, venid_h;
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int ret = 0;
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smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
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GFP_KERNEL);
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if (!smsc) {
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dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
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return -ENOMEM;
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}
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smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
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if (IS_ERR(smsc->regmap)) {
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ret = PTR_ERR(smsc->regmap);
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goto err;
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}
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i2c_set_clientdata(i2c, smsc);
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smsc->dev = &i2c->dev;
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#ifdef CONFIG_OF
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of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
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#endif
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regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
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regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
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regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
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regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
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dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
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devid, rev, (venid_h << 8) | venid_l);
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ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
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if (ret)
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goto err;
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#ifdef CONFIG_OF
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if (i2c->dev.of_node)
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ret = of_platform_populate(i2c->dev.of_node,
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NULL, NULL, &i2c->dev);
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#endif
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err:
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return ret;
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}
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static int smsc_i2c_remove(struct i2c_client *i2c)
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{
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struct smsc *smsc = i2c_get_clientdata(i2c);
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mfd_remove_devices(smsc->dev);
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return 0;
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}
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static const struct i2c_device_id smsc_i2c_id[] = {
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{ "smscece1099", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
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static struct i2c_driver smsc_i2c_driver = {
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.driver = {
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.name = "smsc",
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.owner = THIS_MODULE,
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},
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.probe = smsc_i2c_probe,
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.remove = smsc_i2c_remove,
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.id_table = smsc_i2c_id,
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};
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module_i2c_driver(smsc_i2c_driver);
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MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
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MODULE_DESCRIPTION("SMSC chip multi-function driver");
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MODULE_LICENSE("GPL v2");
+109
include/linux/mfd/smsc.h
+109
include/linux/mfd/smsc.h
···
1
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/*
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* SMSC ECE1099
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*
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* Copyright 2012 Texas Instruments Inc.
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*
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* Author: Sourav Poddar <sourav.poddar@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#ifndef __LINUX_MFD_SMSC_H
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#define __LINUX_MFD_SMSC_H
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#include <linux/regmap.h>
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#define SMSC_ID_ECE1099 1
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#define SMSC_NUM_CLIENTS 2
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#define SMSC_BASE_ADDR 0x38
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#define OMAP_GPIO_SMSC_IRQ 151
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#define SMSC_MAXGPIO 32
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#define SMSC_BANK(offs) ((offs) >> 3)
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#define SMSC_BIT(offs) (1u << ((offs) & 0x7))
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struct smsc {
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struct device *dev;
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struct i2c_client *i2c_clients[SMSC_NUM_CLIENTS];
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struct regmap *regmap;
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int clk;
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/* Stored chip id */
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int id;
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};
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struct smsc_gpio;
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struct smsc_keypad;
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static inline int smsc_read(struct device *child, unsigned int reg,
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unsigned int *dest)
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{
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struct smsc *smsc = dev_get_drvdata(child->parent);
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return regmap_read(smsc->regmap, reg, dest);
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}
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static inline int smsc_write(struct device *child, unsigned int reg,
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unsigned int value)
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{
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struct smsc *smsc = dev_get_drvdata(child->parent);
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return regmap_write(smsc->regmap, reg, value);
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}
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/* Registers for SMSC */
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#define SMSC_RESET 0xF5
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#define SMSC_GRP_INT 0xF9
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#define SMSC_CLK_CTRL 0xFA
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#define SMSC_WKUP_CTRL 0xFB
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#define SMSC_DEV_ID 0xFC
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#define SMSC_DEV_REV 0xFD
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#define SMSC_VEN_ID_L 0xFE
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#define SMSC_VEN_ID_H 0xFF
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+
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/* CLK VALUE */
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#define SMSC_CLK_VALUE 0x13
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/* Registers for function GPIO INPUT */
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#define SMSC_GPIO_DATA_IN_START 0x00
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/* Registers for function GPIO OUPUT */
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#define SMSC_GPIO_DATA_OUT_START 0x05
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/* Definitions for SMSC GPIO CONFIGURATION REGISTER*/
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#define SMSC_GPIO_INPUT_LOW 0x01
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#define SMSC_GPIO_INPUT_RISING 0x09
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#define SMSC_GPIO_INPUT_FALLING 0x11
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#define SMSC_GPIO_INPUT_BOTH_EDGE 0x19
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#define SMSC_GPIO_OUTPUT_PP 0x21
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#define SMSC_GPIO_OUTPUT_OP 0x31
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#define GRP_INT_STAT 0xf9
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#define SMSC_GPI_INT 0x0f
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#define SMSC_CFG_START 0x0A
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/* Registers for SMSC GPIO INTERRUPT STATUS REGISTER*/
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#define SMSC_GPIO_INT_STAT_START 0x32
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/* Registers for SMSC GPIO INTERRUPT MASK REGISTER*/
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#define SMSC_GPIO_INT_MASK_START 0x37
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/* Registers for SMSC function KEYPAD*/
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#define SMSC_KP_OUT 0x40
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#define SMSC_KP_IN 0x41
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#define SMSC_KP_INT_STAT 0x42
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#define SMSC_KP_INT_MASK 0x43
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/* Definitions for keypad */
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#define SMSC_KP_KSO 0x70
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#define SMSC_KP_KSI 0x51
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#define SMSC_KSO_ALL_LOW 0x20
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#define SMSC_KP_SET_LOW_PWR 0x0B
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#define SMSC_KP_SET_HIGH 0xFF
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#define SMSC_KSO_EVAL 0x00
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#endif /* __LINUX_MFD_SMSC_H */